Hose clamp



Feb. 9, 1932. c, M TERRY 1,844,023

HOSE CLAMP Filed Jan. 2. 1929 INVENTOR CHARLES M. TERRY quita-W..

ATTQRNE .Patented Feb. 9, 1932 .I

UNITED STA TssPA'raN'r oFFllci-z amants u. wimax. or nncn'run, immers,as srenoa'- 'ro A. w.' casu' conm, or

- imcumn. ILLINOIS, n coaronArIoN or miuwann fixosiccnain'- Appunti@ meannuuy a,4 i929.' serial iin. 329,796.

l This invention relates to hose clamps, and

more particularly to a device of this type which will serve to hold aflexible hose firmly lin position on its connecting member againsta-high iiuid pressure. l J

Considerable diiculty is-experie'nced with hose clamps as heretoforeconstructed, in that they frequently permit leakage of fluidl under highpressure, and the hose is'sometimes even blown entirely away from itsconnection. Moreover, these prior devices are often diilicult to apply,and it is sometimes necessary to use a vise or other special tool forthis purpose. In addition,.the life of aliose when used with theordinary clamp is usually very short, particularly when it is beingmoved about a great deal since the tendency is for the hose to bend sarply at a point close to the clamp, and this sharp bending places an Vexcessive strain on the lmaterial forming the hose.

It is accordinglyone ob 'ect of my invention to overcome suchdiiiiculties and to provide a hose' clamp which will`be effective tomaintain a connection and preventleakage even under extremely highpressures.

Further objects of my invention are to pro- Y vide `a hose clamp whichmay be easily apl. plied without special tools, which will pro'- thehose by preventing it.

long the life o from bending too sharply adjacent to the clamp, andwhich will b e simple and inexpensive to manufacture. y With these andother objects Vin view, as will be apparent to those skilled in the art,my invention-resides in thev'combination of parts set forth in the scificationand covered by the claims appen ed hereto.

Referringto the drawings illustrating one embodiment ofmy invention, andin which like reference numerals indicate like parts: Fig. 1 isalongitudinal section through the center of the device, thcsection beingtaken on the line 1-1 of Fig. -65/ f Fig. 2 is a side elevation showingthe externalappearance of the device;

Fig. 3 is a detail view of the member tov L which the .hose is attached;

. Fig. ,y is a detail view of\one` of the clampil'lgblocks; 1

' Fig. 5 is a cross section on the line 5-.5

o f Fig. 1 I" Fig. 6 is. a cross section on the line 6 6 of Fig. 1; 'andF'g. 7 is a cross section on the line 7-7 of In accordance with myinvention, I rovide a hose clamp arranged to secure a exi- `ble hose onthe end of a pipe inserted therein.

`tegral hook portions which contact with a shoulder on the pipe, andthis shoulder may have projections which space the blocksproperly atassembly. v k The embodiment of the invention illustrated in thedrawings comprises a connecting member 10 provided with a. cylindricalprojecting pipe or spud 11 to which a flexible hose 12 isl attached.Thehose may be of rubberand fabric or of any other construction whichwill provide flexibility and Sirf-- ficient strength to withstand' thepressure of the -iluid to e transmitted. The projection 11 is preferablyprovided with circumferential grooves- 14 vwhich form sharp edges andaid in keeping the hose in position. The outside diameter of the Spud-issomewhat greater than the normal internal diameter of4 the hose, so thatthe hose is stretched slightly in forcing it thereon. The member 10 isformed with a central openingv 15 to permit flow therethrough.

It will be understood-that the member 10 may be used at either the inletor the outlet cnd of the hose, and ordinarily will be used at both ends,and that it may be constructed in various ways to effect a 'desiredlconnection. In the' embodiment illustrated I have shown this member asprovided with external screw threads 16 at the end opposite `the Spud11, in order thatit may be screwed into ribs 21 (Fig. 1) may adjacenttion. The flange 26 is a correspoudingl tapped opening in a'pump,nozzle, or other evice. A hexa onal portion 18 is located adja'cent tothe t reads 16 for nvenence in applying a wrench at assem- In order toprevent leakage and hold the hose 12 firmly in position under high fluidpressure, it is necessary to make use of a suitable clamping device. Forthis purpose I rovide clamping blocks 20, preferably three in number asillustrated, which are equally s aced about the outer periphery of thehose.

ach block 20 is substantially rectangular in shape, as illustrated inFig. 4, and its inner surface is curved to fit the outside of the hoseas shown particularly in Fig. 6. Transverse be provided on this innersurface for the purpose of adding strength and im roving the frictionalvgrip onthe hose. Eac vided with a lateral projection 22 on one side anda corresponding recess pr notch 23 on the other side. At assembl eachpro'ection'fits into the notch on the a jacent bloc and thus tends toprevent bulging of the hose between the blocks. Each of the blocks 2O isprovided at one end with a narrow inwardly extending hook shaped portion25 arranged to hook over a peripheral iiange or shoulder 26 on themember 10 and thus hold the block in posipreferably provided with threespaced, radially extending projections 27 which are of'assistance inproperly locating the blocks at assembly.

y For the lpurpose of forcing the blocks 20 firmly against the hose, Iprovide an outer clamping member shown as a hollow. substantiallycylindrical sleeve 30 which is arranged co-axial with the hose andsurrounding the blocks. Each block is preferably tapered longitudinallywith the thick portion to the hook 25, as shown particularly in Fig. 1,and the sleeve 30 may exert pressure on the blocks because of thewedging action caused by forcing' the sleeve over the tapered blocks. Inorder to facilitate assembly and hold the' sleeve in place Ipreferably.l provide screw threads 32 on the outer surface of the blocks20, and cooperating screw threads 34 on the inner surfaceof the sleeve30. As shown in Fig. 1, the threads 34 are 1 tapered to correspond withthe taper of the threads 32. It will be understood that the screwthreads serve as cams, and so are the full equivalent of various camarrangementsI that may be used. I prefer to utilize as many threads onthe inside of the sleeve as there are clamping blocks, since thisconstruction permits all the clamping blocks to be made eX- actly alike,thus reducing the cost of manufacture and rendering it unnecessary toarrange the blocks in any particular order at assembly. For example, inthe embodiment illustrated there are three of the blocks 20, and Ihavetherefore shown a triple thread block 20 is preferably p ro- .on theinside of the sleeve, as indicated in Fig.

three equally spaced points around the periphery, a substantially evenpressure is transmitted to the hose, and leakage is elfec- -tuallyprevented. Although in most cases the `sleeve can be tightenedsuiliciently by hand, I preferably providediametrically opposite flatspots 36 (Fig. 2) on the outer surface of the sleeve, be applied theretoif desired.

A further feature of the invention involves a construction which isarranged to prevent damage to the hose caused by too shar a bendingthereof adjacent to the clamp. or this purpose I reduce the insidediameter of the sleeve at the point 40 in the rear of the blocks 20 sothat it ts the outside of the hose rather closely, and in the rear ofthis reduced section I provide a Haring or bell shaped portion 41, theinner surface of which is formed with a comparatively long radius ofcurvature. It will now be seen that, as the hose is swung about relativeto the hose clamp, it will bend over the inner curved surface of thebell 41, and because of the long radius no damage will be done to thehose from such bending.

In assembling the device the sleeve 30 is first slipped over the hose,and the hose is then forced over the spud 11. The blocks 20 are nextplaced in position around the hose without regard to any particularorder of arrangement, and the sleeve is screwed tightly over them. Theprojections 27 space the blocks properly and prevent them from turning.Because of the tapered construction of the 'clamping blocks a tremendouspressure can be exerted on the hose with a comparatively slight effortapplied to the sleeve. The complete assembly can be made by hand withoutthe necessity of using tools.

The device is simple and inexpensive to manufacture. The only machinework necessary in the embodiment illustrated is involved in producingthe screw threads 16, and these threads may be eliminated by forming thespud 11 integral with the device to which the hose is to be connected.

Having thus described my invention, what I claim as new and desire tosecure by Letters Patent is 1. A hose clamp comprising a member having ahollow cylindrical projection arranged in order that a wrench may i 15periphery of the ing in thickness longitudinally and having screwthreads on its outer surface, the blocks having their threadsidentically arranged and being interchangeable, and a hollow cylindri- 5cal sleeve provided with multiple internal screw threads correspondingin number to the number of blocks, said sleeve bein arranged to screwover the outside of the b ocks and force them against the hose, therebylo clamping the same against said projection.

2.' A hose clamp comprising a member hav- `ing a hollow cylindricalprojection arranged to enter the openin in the hose, three blocksarranged to be aced around the outer ose, each'block tapering 1nthickness longitudinally and having screw threads on its outer surface,the blocks having their threads identically arranged and beininterchangeable, and a hollow cylindrica gn sleeve provided with tripleinternal screw threads, said sleeve being arranged to screw over theoutside of the blocks and force them against the hose, thereby clampingthe same against said projection. j g5 3. A connecting device for a hosecomprising a member having a hollow cylindrical projection arranged toenter the opening in the hose'andhaving a shoulder thereon, a pluralityof blocks arranged to be placed 30 around the outer Reriphe of the hose,each block tapering in t ickness ongitudinally and having screw threadson its outer surface the blocksv having narrow s acedhooks which contactwith said shoul er at assembly, a `3|; hollow cylindrical sleeveprovided with `internal screw threads arranged to screw over the outsideof the blocks and force them against the hose, and a plurality of spacedradially extending projections on said meml 40 ber which are locatedbetween the hooks and serve to space the blocks properly at assembly andprevent them from turning when the sleeve is screwed' over the blocks.

Signed at Decatur, Illinois, this 29th day of December, 1928.

CHARLES M. TERRY.

